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What trans will fit a 1989 Dodge van b250 three quarter ton with 318 that has an overdrive button on the dash?

A 1989 Dodge B250 three-quarter ton van with a 318 engine and an overdrive button on the dash likely has a 727 TorqueFlite automatic transmission with an overdrive unit. However, it's *crucial* to verify this by checking the transmission identification tag on the transmission itself. The tag is usually located on the driver's side of the transmission case.

While a 727 with overdrive is the most likely candidate, there's a small chance of other transmissions having been swapped in over the years. Therefore, checking the tag is the only definitive way to know for sure.

If you find a 727 with an overdrive, the replacement will need to be a 727 with an electric overdrive. Simply finding a 727 isn't enough; the overdrive functionality is key. The year of the replacement transmission isn't as critical as matching the 727 designation and the presence of the electric overdrive.

Before attempting any transmission replacement:

* Confirm the transmission identification: This is paramount.

* Consider professional help: Transmission replacement is a complex job best left to experienced mechanics.

* Research compatibility: Even within 727 transmissions, there can be variations based on year and application. A reputable parts supplier (or mechanic) should be consulted to ensure compatibility.

Don't rely solely on the overdrive button; always verify the transmission type directly.